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Dephosphorization and iron-increasing method of high phosphorus hematite by direct reduction

A technology of hematite and hematite powder, which is applied in the field of direct reduction dephosphorization of high-phosphorus hematite, can solve the problems of low recovery rate, high cost of chemical methods, and high cost of beneficiation methods, and achieve dephosphorization rate and The iron yield is high, the residue can be recycled, and the effect of avoiding corrosion of the furnace lining

Inactive Publication Date: 2011-03-09
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mineral processing methods have high cost and low recovery rate (Lin Xianghui, Luo Renmei, etc. New progress in mineral processing and chemical research of refractory iron ore in western Hubei, Mining Engineering, 2007(3): 28-29); chemical methods have high cost and waste water treatment Problem: Although biotechnology is environmentally friendly and low in energy consumption, it has the problems of long process flow, complex operation management, low efficiency, and high cost (He Liangju, Hu Fangren, Wei Dezhou. Research on microbial dephosphorization of high-phosphorus iron ore in Meishan, Mining and Metallurgy , 2000(1): 31~35); in the case of dephosphorization by smelting, most of the cases will add CaF to the slagging agent 2 , CaF at high temperature 2 Not only corrodes the furnace lining, but also pollutes the environment

Method used

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  • Dephosphorization and iron-increasing method of high phosphorus hematite by direct reduction
  • Dephosphorization and iron-increasing method of high phosphorus hematite by direct reduction
  • Dephosphorization and iron-increasing method of high phosphorus hematite by direct reduction

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Embodiment 1

[0019] The invention discloses a method for directly reducing high-phosphorus hematite to dephosphorize and improve iron. First mix 60-70wt% high-phosphorus hematite powder, 13-15wt% carbonaceous reducing agent, 12-15wt% quicklime and 5-10wt% additives, press into agglomerates, dry, and then Reduction in the furnace at 1250-1300°C, heat preservation for 15-30 minutes; cooling down to 600-800°C with the furnace, taking out the reduced products, cooling naturally, grinding, and magnetic separation to obtain pig iron particles.

[0020] The additive in this embodiment is sodium carbonate, the high-temperature furnace is a resistance furnace, and the atmosphere in the furnace is adjusted to be a neutral atmosphere.

[0021] In this embodiment, the reduction time is short, the process is simple, the environmental pollution is small, the residue can be recycled, the dephosphorization efficiency is 82% to 90%, the carbon content in iron is 3.5% to 3.8%, and the iron yield is 85% to 9...

Embodiment 2

[0023] The invention discloses a method for directly reducing high-phosphorus hematite to dephosphorize and improve iron.

[0024] The additive in this embodiment is potassium carbonate, the high-temperature furnace is a rotary hearth furnace, and the atmosphere in the furnace is adjusted to be a neutral atmosphere. All the other are with embodiment 1.

[0025] In this embodiment, the reduction time is short, the process is simple, the environmental pollution is small, the residue can be recycled, the dephosphorization efficiency is 79% to 87%, the carbon content in iron is 3.7% to 3.9%, and the iron yield is 83% to 89%. .

Embodiment 3

[0027] The invention discloses a method for directly reducing high-phosphorus hematite to dephosphorize and improve iron.

[0028] The additive in this embodiment is a mixture of sodium carbonate and potassium carbonate, the high-temperature furnace is a rotary kiln, and the atmosphere in the furnace is adjusted to be a weakly reducing atmosphere. All the other are with embodiment 1.

[0029] In this embodiment, the reduction time is short, the process is simple, the environmental pollution is small, the residue can be recycled, the dephosphorization efficiency is 82% to 91%, the carbon content in iron is 3.6% to 4.1%, and the iron yield is 87% to 91%. .

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Abstract

The invention particularly relates to a dephosphorization and iron-increasing method of high phosphorus hematite by direct reduction, and the technical scheme comprises the following steps: mixing 60-83wt% of high phosphorus hematite powder, 10-15wt% of carbonaceous reducing agent, 6-15wt% of quicklime and 1-10wt% of additive uniformly, pressing the mixture into blocks, drying, reducing in a high temperature furnace under 1250-1350 DEG C, and keeping the temperature for 15-30 minutes; carrying out furnace cooling until the temperature is 600-800 DEG C, taking the reduction product out, naturally cooling, grinding and performing the magnetic separation to obtain pig iron particles. The additive is sodium carbonate, or potassium carbonate, or the mixture of the sodium carbonate and the potassium carbonate; drying is carried out under the condition of 110-120 DEG C until the weight of the mixture of raw materials is constant; and the high temperature furnace is a resistance furnace, or a rotary kiln, or a rotary hearth furnace, and the atmosphere in the high temperature furnace is neutral or weak-reductive. The invention has the advantages of short reduction time, simple process, high dephosphorization rate, high iron yield, less environmental pollution, recyclable residue and the like.

Description

technical field [0001] The invention belongs to the technical field of iron ore dephosphorization, and in particular relates to a method for directly reducing and dephosphorizing high-phosphorus hematite to increase iron. Background technique [0002] With the rapid development of my country's iron and steel industry, the demand for iron ore is increasing. However, the substantial increase in the price of imported iron ore has caused my country's iron and steel industry to face enormous pressure on resources. However, the impurity content of domestic iron ore is relatively high, so that many iron ores cannot directly enter the smelting process, especially in Hubei, Hunan, Yunnan and other places in my country, there are a large number of high-phosphorus iron ore. Generally speaking, the phosphorus in iron ore cannot be removed to a qualified level by conventional beneficiation methods, and the cost is extremely high, which will lead to the fact that my country's high-phosph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/00C22B1/14
CPCY02P10/20
Inventor 李光强李永军朱诚意樊希安
Owner WUHAN UNIV OF SCI & TECH
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